Catalytic Hydrolysis of Polysaccharides Derived from Fast-Growing Green Macroalgae

Ayumu Onda, Sayuri Onda, Miyuki Koike, Kazumichi Yanagisawa, Shuntaro Tsubaki, Masanori Hiraoka

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


Green macroalgae, such as Ulva spp., has a higher growth rate than terrestrial lingocellulosic biomass, which often leads to serious environmental issues such as green tide. So, it is a promising feedstock for biorefineries. Hiraoka produced Ulva with reproducible compositions and sizes by our original cultivation method. The macroalgae contained approximately 35 wt % of a soluble polysaccharide called ulvan, which is a sulfated glucuronorhamnan polysaccharide. The catalytic conversion of extracted ulvan was performed under hydrothermal conditions at 130 °C by using solid acid catalysts. The Amberlyst 70 catalyst has a stable structure and gave monosaccharides in quantitative yield, predominantly in the form of rhamnose. The Amberlyst 70 catalyst showed higher activity than sulfonated activated-carbon (AC-SO3H) in the hydrothermal conversion of ulvan, although Amberlyst 70 showed lower catalytic activity than AC-SO3H in the hydrolysis of starch.

Original languageEnglish
Pages (from-to)2638-2641
Number of pages4
Issue number14
Publication statusPublished - Jul 24 2017
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry


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